38
3. Set Home Position. Place the telescope in the home position.
To Set the Home Position Manually:
a. See Figs. 19 and 20, page 37. Loosen the telescope’s Dec. lock (17, Fig.
1). Set the optical tube to 0°on the Dec. setting circle (Fig. 20).
b. Tighten the Dec. lock (17,Fig. 1)to a firm feel only.
c. Level the tripod base.
d. Move the base of the telescope so that the computer control panel (13, Fig.
1)approximately faces South.
e. Unlock the R.A. lock (12, Fig. 1)and turn the telescope's optical tube hori-
zontally until it points North. See Fig. 37, page 52, for more information.
f. Re-lock the R.A. lock (12, Fig. 1). Press ENTER.
g. Press ENTER.
4. Star Alignment. "Select Star" displays. Autostar II then displays a library of stars
for the observer to choose from. Use the Scroll keys to scroll to a star on the list
that you wish to align upon. Select a star that you can easily locate in the night
sky. Press ENTER.
5. Center Star. The telescope slews to the star. Use the Arrow keys to move the
telescope until the star is centered in the eyepiece. Press ENTER.
6. Center Star. Repeat procedure for the second alignment star. The telescope is
aligned and you are now ready to use Autostar II's GO TO capabilities for a night
of observing.
One-Star Alt/Az Alignment
One-Star Alignment requires some knowledge of the night sky. Autostar II provides a
library of bright stars. One-Star Alignment is identical to Two-Star Alt/Az: Alignment
(see TWO-STAR ALT/AZ ALIGNMENT, page 37), except only one star from the data-
base is chosen by the observer for alignment.
Note:
Autostar II locates align-
ment stars based on the
date, time, and location
entered.The alignment
stars may change from
night to night.All that is
required is for the observer
to center the selected stars
in the eyepiece when
prompted.
Tip:
Try a Spiral Search
The GO TO key also
allows you to perform a
"spiral search." A spiral
search is useful when the
telescope slews to an
object, but that object is
not visible in the eyepiece
after the telescope finish-
es its search.(This some-
times occurs during an
alignment procedure.)
Press GO TO when the
slew is finished and the
telescope starts slewing in
a spiral pattern at a very
slow speed around the
search area.Look through
the eyepiece and when
the object does become
visible, press MODE to
stop the spiral search.
Then use the Arrow keys
to center the object.

Mirror, Mirror...

The LX200GPS telescopes provide features that allow you to control the primary opti-
cal mirror and focus functions for more precise viewing capability.
One control feature is the primary mirror lock (9,Fig. 1). The primary mirror lock helps
eliminate mirror flop. Mirror flop can sometimes occur when the optical tube slews to
opposite sides of the sky and the primary mirror shifts out of position, causing the loss
of focus and pointing precision. To prevent mirror flop: Rotate the primary mirror lock
knob toward the "lock" position and adjust the tension to a firm feel.
Another control feature is the zero-shift microfocuser (24, Fig. 1). The microfocuser
allows for "jiggle-free" focusing. It also allows you to achieve focus without causing a
viewed object to move out of position in the eyepiece.
Some tips to help you make the most out of your microfocuser (see FOCUSING THE
EYEPIECE USING THE MICROFOCUSER,page 17, for more detailed instructions):
1. Set the "travel" (extension) of the drawtube of the microfocuser to about
halfway.
2. Rotate the mirror lock knob towards the "unlock" position, until it feels loose.
3. Use the coarse focus control (6, Fig. 1) to achieve a rough focus of a bright star.
4. Rotate the mirror lock knob towards the "lock" position and adjust the tension to
a firm feel; this action serves to lock in the coarse focus. But make sure that
you don't adjust or bump the coarse focus knob once you have tightened
tension on the mirror.If you do, reset the coarse focus as described
above.
5. Press the Autostar II Focus key and then use the Up and Down keys to control
the microfocuser. If desired, you may change the focus speed.
6. You may need to repeat this procedure when you change eyepieces.
LX200GPS TIPS